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Only a third (33%) of people believed being able to speak Welsh made someone Welsh, according to the study by internet-based market research firm YouGov.
In a survey of more than 1,000 people in Wales, more than 90% thought being born in the country made someone Welsh.
Second on the list was having two Welsh parents, with 87% backing the option.
The only other factors to gain majority support were "growing up in Wales" (68%) and having a Welsh parent (61%).
Only about four in 10 people believed someone "considering themselves Welsh" made them Welsh.
Matthew Smith, of YouGov, said: "What makes a person Welsh is a question that raged for a while - especially in light of sports stars representing the country despite seemingly having light links with it.
"However, it is clear from our research that what makes a person Welsh is quite a broad church.
"The key thing seems to be a person's heritage - be it being born in Wales, having a Welsh parent or growing up here."
YouGov carried out online interviews with 1,005 adults aged 18 or over in Wales between 23 and 27 September.
Most Welsh people think you have to be born in Wales to be Welsh, new research has said.

The eight-times British champions have been told they cannot compete in the restructured Premiership in 2017 as they no longer have a proper home.
Denmark's Olsen, one of the game's greats, says English speedway is 'going downhill' and fears for the future.
"I don't think it's looking that good, particularly in England," Olsen said.
"Some other countries, they're booming," he told BBC Coventry & Warwickshire. "But, over the years, English speedway has been going downhill a bit.
"It has been sad to see. But I am also very pleased that I was a part of it when it was so great. I have fantastic memories of when we won the league.
The 70-year-old former Newcastle, Wolves and Bees rider added: "When I arrived, there were 22 clubs in the league. We played just once at each others' tracks, home and away.
"But now some of the tracks are not up to shape. Sadly, there has not been enough investment into the stadiums.
"England is still creating world champions like Tai Woffinden, at Wolves, so I don't know what's happened."
The British Speedway Promoters Association, who made the decision to put the Bees' licence 'on ice', are still optimistic about the club's future.
"I think there could be a new venue found, I really do," BSPA chairman Keith Chapman told BBC Coventry & Warwickshire.
"Who knows what could happen? If the right person could come in and bring it back to life, Brandon is one of the best venues in the country."
Coventry's problems are the latest to affect the club speedway scene.
Manchester side Belle Vue are on the up again after moving into the £8m National Speedway Stadium in March 2016, before being taken over last week.
But, although the Midlands can boast Wolverhampton Wolves as reigning league champions, having won the final Elite League title in 2016, the region has suffered.
Cradley Heathens, the 1981 and 1983 league champions, folded in 1996. And, although they reformed in 2010, they have been unable to secure their own permanent home.
Neighbours Birmingham have suffered financial problems in recent seasons, which cost them their place in the old Elite League.
Former world champion Ole Olsen is worried for the future of speedway in this country following the problems suffered by his old club Coventry Bees.

Russia is Turkey's second most important foreign trading partner after Germany.
As a result, experts say economic retaliation would be keenly felt by Ankara - but the Kremlin would not be unharmed either.
Here the BBC's Russian Service looks at the main trade links between Russia and Turkey that risk being hit hardest by the downturn in relations.
Turkey is the top foreign holiday destination for Russian tourists. Some 3.2 million Russian holidaymakers travelled to Turkey last year, according to Russia's Federal Tourism Agency. In comparison, 2.5 million went on holiday to Egypt.
Until the past year, Russians made up the largest group of tourists in Turkey. But they lost the top spot to Germans because of the fall of the rouble.
Bookings to Turkey went back up after Russia banned flights to Egypt following the Sinai plane crash on 31 October. However, the downing of the Russian SU-24 warplane by Turkey means it is unlikely this trend will continue.
Turkey bought 57% of its gas from Russia in 2013.
Last year it became the second largest consumer of Russian gas after Germany: Germany imported 36bn cubic metres (bcm) and Turkey imported 27.3bcm.
Turkey gets its Russian gas via two routes - the Blue Stream pipeline across the Black Sea, and the gas transportation corridor through Romania, Ukraine and Moldova.
Plans for a "Turkish Stream" to transport 63bcm of Russian gas through Turkey and on to Europe - bypassing Ukraine - have stalled since they were announced by the Russian and Turkish presidents in December 2014.
Turkey has to import nearly all the energy it consumes.
In 2012, Moscow and Ankara agreed to build Turkey's first nuclear power plant, the Akkuyu plant. It was designed to save Turkey about $14bn (Â£9bn) annually on energy imports.
The nuclear power plant is now under construction in the province of Mersin on the Mediterranean coast. Russia has already invested $3bn in it.
In October, the Turkish authorities said Russia's military activity in Syria could threaten its future involvement in the project.
President Recep Tayyip Erdogan said in October: "If the Russians don't build Akkuyu, someone else will come along and build it."
There are about 100 Turkish construction companies working in Russia.
Turkish firms have built more than 800 projects in Russia since the end of the 1980s, according to official Russian data.
Turkish investors also have stakes in a number of brands sold in the Russian market, such as Tevolina shoes and the Gloria Jeans clothes brand, as well as the food and chemical industries.
On Wednesday the Russian state-owned news agency RIA Novosti quoted Gennadiy Onishchenko, an aide to the Russian prime minister, as saying that people who bought Turkish goods financially supported Turkish servicemen.
"Everyone understands that each Turkish tomato bought... is a contribution to yet another missile which will be shooting at our guys," he was quoted as saying.
Compiled by Dmitry Bulin

Russia has warned of heavy economic sanctions after Turkey shot down a Russian warplane on its border with Syria.

